chap. 15, 17 and 18 543-559
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Emotional response | show 🗑
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Autonomic arousal emotional response | show 🗑
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show | objective automatic responses to a situation -Physical movements in response to a situation, different between species -defending or attacking in response to a threat
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Motivation emotional response | show 🗑
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show | Subjective component of emotions, humans feel as they experience -The feelings described as "emotions" have been associated w/physiological responses through learning/experience -can't be measured, only talk to humans about feelings
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James-Lange theory | show 🗑
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Cannon-Bard theory Emotions help us deal wit the environment | show 🗑
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Schacter theory | show 🗑
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show | Very easy to model, emotional response to a perceived threat -Amygdala is central to fear, reactions to stimuli w/biological significance(smelling smoke)
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Amygdala and fear response | show 🗑
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show | integrates incoming sensory info, projects fear to Gray(behavior), Lateral(autonomic/feeding), BNST(hormonal) -Critical to emotion provoked by aversive stimuli=increase in activity -Artificial stimulation produces signs of fear/agitation (no stimuli)
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Thalamus in fear | show 🗑
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Sensory cortex in fear | show 🗑
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show | Sends input to amygdala about memories about stimuli
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show | Receives info from Central nucleus of the amygdala Behavioral response
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Lateral Hypothalamus in fear | show 🗑
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Bed nucleus of the Stria terminalis (BNST) in fear | show 🗑
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show | result in loss of fear to aversive stimuli -no fear, really melow animals -Tame animals, fewer stress hormones, decreased anxiety, less stress,induced illness -fear is the reason animals react badly
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Lesions on CN of amygdala (humans) | show 🗑
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Kluver-Bucy syndrome | show 🗑
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show | Central Nucleus of Amygdala role in aversive emotional learning -Neutral sti. + Fear-inducing sti. = learned fear response to the neutral sti. ex. tone plus shock= tone causes fear -CNA is destroyed, animals won't learn this conditioned emotional resp.
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show | Behavioral response involving threatening gestures or an attack on another animal -Species-specific, controlled by genetically organized neural circuits related to both reproduction/self defense -Circuits are very hormone sen. -Controlled by PAG
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Periaqueductal grey in aggression | show 🗑
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Dorsal PAG in aggression | show 🗑
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show | Controls eating, hunting behaviors
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Prefrontal cortex | show 🗑
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show | results in faulty emotional regulation (didn't develop correctly/damage) -Poor impulse control, aggression/violence
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show | Correlated w/a reduction in gray matter of the prefrontal cortex
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show | Part of the oritofrontal cortex Critical to emotional regulation Damage: lack of emotional regulation, impaired planning, social res., impulsive aggression/violence
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Medial prefrontal cortex | show 🗑
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Serotionin in aggression | show 🗑
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show | Juvenile monkey's w/low 5-HT show increased risk-taking behavior/aggressive attacks on dominant monkeys -Impulsive behavior= death
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show | Mice lacking the 5-HT receptor exhibit increased aggression on other mice
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show | Inhibits aggression/impulsive behaviors Low levels: correlated w/aggression, assault, arson, murder, child abuse -Agonists decrease irritability, aggressiveness/impulsivity on psychological measures
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show | Prenatal androgen exposure organizes neural circuits controlling aggression -puberty, testosterone activates these circuits, increasing aggressive behaviors
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Medial preoptic area | show 🗑
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Castration | show 🗑
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Androgen antagonists | show 🗑
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High levels of androgen | show 🗑
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show | increasing aggression
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Androgens | show 🗑
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Communication of emotions | show 🗑
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show | Innate responses, automatic/involuntary -RIght hemisphere is critical to expression of emotion -Darwin: ppl of isolated tribes recognize the meaning of facial expressions /make the same expressions -Blind children
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Innate responses | show 🗑
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Right Hemisphere of brain | show 🗑
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show | a lot of expressions that escape prefrontal can't stop it
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Facial muscles | show 🗑
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show | major role of facial expression -Face accessory to verbal communication= emphasis/direction of combo
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Recognition of emotion | show 🗑
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show | Physiological/psychological response to a situation(not emotion) -General adaptation syndrome -Hormones: corticosteroid ex. cortisol from adrenal cortex
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show | Connection between stress/disease -Alarm response: initial res. to stress -Adaptation stage: 2nd activation of appropriate response systems/reest. of homeostatic balance -Exhaustion stage: increased susceptibility to disease
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Cortisol | show 🗑
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show | Brain sti. immune function -Organs-thymus,spleen,lymph nodes,bone marrow produce: Phagocytes,B/T lymphocytes, Helper T cells -Monitored/regulated by brain cytokine receptors on the vagus nerve
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Phagocytes | show 🗑
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B Lymphocytes | show 🗑
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show | formed in thymus gland act as killer cells -Specialized cells: T helpers secrete cytokines = proteins that regulate activity B cells divide or die
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Learning | show 🗑
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Synaptic plasticity | show 🗑
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Long-term potentiation(strengthened/increased effect) | show 🗑
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show | Synaptic transmission is more likely to cause an AP in the post-synaptic neuron -last from several mins to years can be induced throughout the brain
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LTP modeled/hippocampal formation | show 🗑
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Perforant pathway | show 🗑
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Experimental induction of LTP | show 🗑
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show | Induce LTP=rapid burst of electrical pulses is delivered to the perforant pathway (~100 pulses/2sec) then wait -Detect: single, short sti. burst delivered to the perforant pathway Pop. (cells surrounding the electrode) EPSP measured in dentate gyrus
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Pos. LTP induction | show 🗑
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show | Synaptic strengthening depends on: NT binding at the synapse + depolarization of the post-synaptic cell(at the same time) -Depolarization of a neuron doesn't strengthen all synapses, only those that are active at the time of depolarization
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3 times of Synaptic modifications = LTP | show 🗑
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show | Critical to est. LTP -Second messenger= activates protein kinases(direct chemical reactions in the chemical reactions in the cell necessary for LTP) -NT binding+depolarization helps Ca get into cell
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NMDA receptors( critical for learning) | show 🗑
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Magnesium ejection | show 🗑
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Dendritic Spike | show 🗑
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show | Individual synapses are strengthened by an increase in AMPA receptors on the post.S membrane (increased response to glutamate ) 3 fold increase
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CaMK enzymes | show 🗑
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show | LTP results in the multiplication of synapses -Most synapses are located on dendritic spines -LTP results in division/multiplication of these spines
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show | Post.S density expands until it perforates=splits into multiple densities>Pre.S active zone splits into corresponding regions>Perforated synapse further divides until the spine branches= 2 spines con. synaptic region
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show | Terminal button of one presynaptic neuron synapsing w/ multiple spines on the Post.S neuron -Increases communication potential between 2 cells 3 fold -2 diff. active zones plus 2 spikes=more synapses
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Presynaptic changes | show 🗑
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show | Retrograde signal from NMDA receptors to the Pre.S membrane -Synthesized in the Post.S membrane in response to Ca influx -Direct messenger tiggers release of glutamate, breaks down quickly very unstable
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show | Neurons that fire together, wire together -Synapses that are reliably active just before the generation of an AP are strengthened -Firing weak & strong synapse on the same Post.S neuron> strengthens the weak synapse by association
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show | Declarative memory: talk about Nondeclarative memory: hard to talk about, act out)
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Declarative memory | show 🗑
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show | Implicit, unconscious knowledge (hard to talk about, act out) -Perceptual: memory of perviously expeienced stimuli -Motor: Procedural learned behavioral seq. -Stimulus-response:learned res. to specific stimuli
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show | Neural changes that result in recognizing a sti. that has been perceived before ex. recognizing new term -Based on synaptic changes in the sensory ass cortices -Later input from the same stimulus results in the same pattern of activation> recognition sti
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show | Learning a specific behavioral response in the presence of a give sti. -Response to an ass. between two stimuli -Simple, automatic responses
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Classical conditioning: Neural mechanisms | show 🗑
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Areas involved in Classical conditioning | show 🗑
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show | Repeated depolarization by strong US synapses, paired w/ recep. activation at weak CS synapses=strengthens -Connections between NE signaling the tone/neurons signaling the behavioral res. is strengthened (firing at tone synapse indepent. AP = freeze beha
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show | Procedural memories: changes that result in a new seq. of movements -Est. new motor skill seq., based on changes in motor system -New behaviors req extensive modifi. of brain circuits, adj produce changes to these circuits
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Neural control of Motor learning | show 🗑
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Intital Motor learning | show 🗑
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repeated Motor learning | show 🗑
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show | thalamus takes in all sensory before cortex + prefrontal (Planning)> Basal Ganglia -Muscle memory in Basal ganglia(damage motor plans wipe out)
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show | learning to make a response in order to gain reinforcement/avoid punishment formation of ass. between discriminative sti, behavioral output, resulting conseq DS= contextual cue
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Operant conditioning con. | show 🗑
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Circuitry of Reinforcement | show 🗑
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Circuitry Of reinforcement con. | show 🗑
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show | Axon bundle extends from midbrain to target of the mesolimbic system (amygdala hippocampus nucleus accumbens) passing through the lateral hypo -Primary system involved in reward motivation addiction
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show | Highly rewarding Dopamine release in the NAc is strongly reinforcing, just about instant rewards=dopamine=addiction -common model of reward motivation( rat keeps pressing bar just to get instant reward from brain even w/o food)
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Neural circuitry of reinforcement Strengthening of synapses by reinforcement | show 🗑
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